I personally wouldn't recommend using any type of wallet on an iPhone or Samsung device etc. Even with the legit apps I think the security is ropey & you're a potential target simply by just using them.
It depends how you use them though, I think there's no problem in keeping small amounts of coins in there.
You also don't keep thousands of dollars in cash in your actual wallet, it's similar to that.
They would be far more useful once more brick and mortar stores start accepting Bitcoin though...
About these fake wallet apps making it through the Apple review process, is this just a blatant case of copyright infringement?
Would Apple actually let malicious apps go through? I wouldn't think so, but I could be wrong... Android on the other hand has a worse track record for that...